Altrusia a flat disc world???

From several episodes this looks like the case,for example in downstream the river started and ended in the swamp,in the elsewhen episode when holly hanging by the rope sees the alternate land of the lost it looks like the upside down side of the disc world,in the hurricane episode the portal Will opened just goes around the valley,the pylons controlled the weather, moons, and sun movements,The Builder claims he built all of the land,so it looks like a alien made world instead of a planet?